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Method for preparing graphene through photo-catalysis

A photocatalysis, graphene technology, applied in the direction of graphene, nano carbon, etc., can solve the problems of difficult control of reduction degree, low reduction degree, and easy cracking of graphene film.

Active Publication Date: 2013-02-13
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But these two methods have their limitations. Although the photothermal deoxidation method does not require any chemical reducing agent and can prepare impurity-free graphene, it often requires a strong laser, and the strong photothermal effect makes the graphene film prepared Easy to break, and the degree of reduction is not easy to control
The method of photocatalytic reduction is relatively mild, but the semiconductor catalysts currently used such as TiO 2 , ZnO, H 3 PW 12 o 40 Both are excited by ultraviolet light, and the degree of reduction is not high in a short period of time

Method used

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Examples

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Embodiment 1

[0096] A method for photocatalytically preparing graphene, comprising the steps of:

[0097] 1) Expansion treatment of graphite:

[0098] Heat 9mL of concentrated sulfuric acid to 80°C, add 1.6g of potassium peroxodisulfate and 1.6g of phosphorus pentoxide, stir at this temperature to completely dissolve the solid, then slowly add 2g of 325-mesh flake graphite, and complete the addition within 5 minutes ; The mixture was reacted at 80°C for 4.5 hours, cooled to room temperature after the reaction, and then added with 350mL of deionized water. After standing for 12 hours, the mixture was filtered through a 0.2μm filter membrane, and the residual acid was washed with a large amount of water; The solid was left at room temperature for 12 hours;

[0099] 2) Oxidation of expanded graphite:

[0100] Take 80mL of concentrated sulfuric acid and place it in an ice bath at 0°C, add the expanded graphite obtained in step 1) to the sulfuric acid solution, then slowly add 10g of potassiu...

Embodiment 2

[0106] Repeat Example 1, its difference is only: in step 4), described 1,4-dihydropyridine derivative (R 1 = H, R 2 =R 3 =COOEt,R 4 =H) was 35 mg.

Embodiment 3

[0108] Repeat Example 1, its difference is only: in step 3) in, the concentration of the aqueous solution of described eosin Y is 1.5 * 10 -3 mol / L.

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Abstract

The invention discloses a method for preparing graphene through photo-catalysis, belongs to the technical field of materials, and relates to a method for synthesizing graphene through the photo-catalytic reduction of an organic hydride donor, an ascorbic acid derivative, an amine derivative, an alcohol derivative or an inorganic hydride donor in a solution with an organic dye or a metal complex dye as a photo-catalyst. The method comprises the following steps: preprocessing graphite; oxidizing the graphite; peeling the obtained graphite oxide to form a graphene oxide; and carrying out photo-catalytic reduction of the graphene oxide under a light irradiation condition especially a visible light irradiation condition. The photo-catalytic system constructed in the invention allows a large amount of single-layer graphene having a high reduction degree to be obtained after the light irradiation especially the visible light irradiation for a short reaction time without any stabilizing agents.

Description

technical field [0001] The invention relates to a method for preparing graphene, in particular to a method for preparing graphene by photocatalysis. Background technique [0002] Graphene is made of sp 2 The two-dimensional network structure composed of carbon has excellent electrical, mechanical and thermal properties. Since its first discovery in 2004, graphene's unique structure, very high surface area and excellent electron transport properties have attracted widespread attention from scientists. It has a very wide application prospect and has become one of the most popular materials at present. [0003] In order to exert the excellent properties of graphene, it is very important to develop a method for preparing graphene with high yield, because the hydrophobicity and easy aggregation of graphene in solution have become the main obstacles to the preparation of graphene. In order to overcome these difficulties, the strategy of chemical oxidation-dispersion-reduction h...

Claims

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Application Information

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IPC IPC(8): C01B31/04C01B32/19
Inventor 吴骊珠张慧慧
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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